whittle



No. 625,9l3. Patented May 30, I899.

' J. WHITTLE. EXHAUST BLAST APPARAT-US FUR LOCUMUTIVE FURNACES.

(Application filed Feb. 8, 1899.) I

2 Sheets-Sheefr I.

(No Model.)

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'rn STATES PATENT OF ICE.

JOHN WHITTLE, OF BOSTON, ENGLAND.

EXHAUST BLAST APPARATUS FOR LOCOMOTIVE-FURNACES.

SPECIFICATION forming part of Letters Patent No. 625,913, dated. May 30,1899.

Original application filed June 28, 1897, Serial No. 642,745. Dividedand this application filed February 8, 1899. Serial j ect of the Queenof Great Britain, residing at Boston, Lincoln county, England, have invented certain new and useful Improvements in Exhaust Blast Apparatusfor Locomotive- Furnaces, of which the 'following is a specification,and which is a division of my application filed June 28, 1897, SerialNo. 642,745.

This invention relates to exhaust blast apparatus forlocomotive-furnaces, and has for its object to provide an improvedblast-nozzle for suppressing'or deadening the sound and forextinguishing any sparks that may be drawn through the fire tubes intothe smoke-box by the force of the blast or while the fire is beingtrimmed. Y

To these ends my invention consists in the features and in theconstruction, arrange-.

ment, and combination of parts hereinafter described, and particularlypointed out in the claims following the description, reference bein ghad to the accompanying drawings, forming a part of this specification,wherein Figure 1 is a vertical central sectional view of my improvedblast-nozzle. Fig. 2 is a partial top plan view thereof, and Fig. 3 is aView showing the nozzle and blast-pipe arranged in the smoke box andstack of a locomotiveboiler.

Referring to the drawings, the numeral 1 indicates the smoke boX of alocomotiveboiler, and 2 the stack thereof. Arranged in the smoke-box isa blast-pipe 3, which at its lower end is connected with the usualexhaust-pipes (not shown) and at its upper end is externally threaded,as ate. Mounted on the upper end of the blast-pipe 3 is a thimble 5,provided at its lower end with a threaded ferrule 6, engaging the threadon the upper end of the blast-pipe, whereby the thimble may be adjustedvertically. The upper end of the thimble 5 terminates in a socket 7 ofthe shape of an inverted frustum of a cone, and fitted in the socket 7is the blast-nozzle 8. The nozzle, as most clearly shown in Fig. 1, iscone-shaped both internally and externally and is formed in a series ofconcentric steps 9, which are of a gradually-decreasing (No model.)

The exhaust-steam as it rushes through thejet-openings is directed infine spreading streams over the entire internal surface of thesmoke-stack and suppresses or deadens the sound of the escaping steamand effectually extinguishes any sparks that may be drawn through thefire-tubes into the smokeboX by the exhaust-blast or while the fire isbeing trimmed. -By means. of the threaded ferrule 6 the blast-nozzle maybe adjusted vertically in the smoke-stack. The conical shape of thesocket 7 permits the escaping steam to spread over the inner surface ofthe nozzle for equaldistribution to and through the jets.

Having described my invention, What I claim is- V 1. A blast-nozzle forsteam-boiler furnaces, consisting of a cone-shaped shell closed at itstop or apex having a series of concentric steps of agradually-decreasing size from the bottom upward, each stepbeingprovided with an annular series of jet-openings inclined upward andoutward and extending entirely through the shell from the inner to theouter steps, substantially as described.

2. A blast-nozzle for steam-boiler furnaces, consisting of a cone-shapedshell having a series of concentric steps of a gradually-decreasing sizefrom the lowermost to the uppermost, each step being provided with anannular series of jet-openings inclined upward and outward and extendingentirely through the shell from the inner to the outer steps, incombination with a blast-pipe, and a socket connected with theblast-pipe and the lower end of the nozzle, said socket being oftheshape of an inverted frustum of a cone, substantially as describedand for the purpose specified.

consisting of a cone-shaped shell having a series of concentric steps ofa grad ually-decreas 3. A blast-nozzle for steam-boiler furnaces,

ing size from the lowermost to the upperthe shell, in combination with athreaded my hand in presence of two subscribing Witblast-pipe, athreaded ferrule arranged on the nesses. threaded blast-pipe, a thirnbleconnected at i 1 its lower end with the ferrule and provided JOHNWVHITTLE 5 at its upper end with a socket in which the Witnesses:

nozzle is fitted, substantially as described. RICHARD Com: GARDNER, Intestimony whereof I have hereunto set J AMEs GEORGE NEWMAN.

